Bunn FMD-1 User Guide

39

FIG. 43 TANK HEATER SWITCH TERMINALS

P1219

BLK to Main

Harnesss

BLK from Main

Harness

FIG. 44 TRANSFORMER

P1666

Location:

 

The transformer is located behind the lower 

front access cover, mounted on the right rear side of 

the component bracket.

Test Procedure:

1.  Disconnect the dispenser from the power source.

2.  Disconnect the four pin plug from the main harness 

from the four pin connector on the transformer.

3  Check the voltage across black wire pin 1 and the

 

white wire pin 2 on the plug from the main har-

ness. Connect the dispenser to power source. The 

indication must be:

 

a) 120 volts ac for two wire 120 volt models,

 

b)  120  volts  ac  for  three  wire  120/208  volt  or 

120/240 volt models,

 

c) 230 volts ac for two wire 230 volt models, after 

a delay of approximately 5 seconds.

4.  Disconnect the dispenser from the power source.

If voltage is present as described reconnect the plug 

and the connector and proceed to #5.

If voltage is not present as described, refer to the wiring 

diagrams and check the main wiring harness.

5.  Check the voltage between J1-1 and J1-2 on the 

eight pin connector at the control board. Connect 

the dispenser to the power source. The indication 

must be 24 volts ac.

If voltage is present as described the transformer is 

operating properly.

If  voltage  is  not  present  as  described,  replace  the 

transformer.

Removal and Replacement:

1.  Loosen the two #8-32 screws securing the com-

ponent bracket to the dispenser housing base.

2.  Pull component bracket out the front of the dispenser 

far enough so the transformer connector can be 

disconnected from the main wiring harness.

3  Disconnect the transformer four pin connector from 

the four pin plug on the main wiring harness.

4.  Remove the two #6-32 keps nuts securing the trans-

former to the rear of the component bracket.

5.  Remove and discard the transformer.

6.  Install new transformer on the rear of the component 

bracket and secure with two #6-32 keps nuts.

7.  Connect the four pin connector on the transformer 

to four pin plug on the main wiring harness.

8.   Place  the  component  bracket  into  position  and 

tighten the two #8-32 screws.

WHI/BLK - T12

WHI/GRN - T7

WHI - 120V T2, 240V T6

BLK - TI

FIG. 45  TRANSFORMER TERMINALS

P1703

29112 101598